Debt - Narrative (Details) $ in Millions	3 Months Ended			9 Months Ended
	Mar. 31, 2025 USD ($) note	Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($) note	Mar. 31, 2024 USD ($)	Apr. 24, 2025 USD ($)	Apr. 02, 2025 USD ($)
Debt Instrument [Line Items]
Number of fixed rate notes issued | note	4			4
Debt face amount	$ 4,000.0			$ 4,000.0
Notional amount of derivatives terminated		$ 1,000.0
Unamortized loss on cash flow hedges	4.7	12.5	$ 0.0	17.2	$ 0.0
Fair value of notes issued	$ 3,739.8			$ 3,739.8
Derivative Instrument, Termination One
Debt Instrument [Line Items]
Notional amount of derivatives terminated		400.0
Derivative Instrument, Termination Two
Debt Instrument [Line Items]
Notional amount of derivatives terminated		600.0
Fixed-rate 4.450% notes due September 9, 2034 | Senior Notes
Debt Instrument [Line Items]
Debt face amount		$ 1,000.0
Stated interest rate	4.45%	4.45%		4.45%
Fixed-rate 3.375% notes due September 15, 2025
Debt Instrument [Line Items]
Stated interest rate	3.375%			3.375%
Fixed-rate 3.375% notes due September 15, 2025 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	3.375%			3.375%
Aggregate notional amount	$ 300.0			$ 300.0
Fixed-rate 3.375% notes due September 15, 2025 | Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Aggregate notional amount						$ 50.0	$ 50.0
Fixed-rate 3.375% notes due September 15, 2025 | Senior Notes | Treasury Lock | Subsequent Event
Debt Instrument [Line Items]
Aggregate notional amount							$ 400.0
Minimum
Debt Instrument [Line Items]
Debt instrument, term				7 years
Maximum
Debt Instrument [Line Items]
Debt instrument, term				10 years